Preheat oven to 325 degrees. In a large bowl, cream together brown sugar, white sugar, butter, and oil. Add eggs, vanilla, and buttermilk; stir well. Sift together the flour, cinnamon, salt, baking soda, and cocoa then add to the mixture. When blended, add shredded zucchini. Then pour into a greased and floured 9- x 13-inch pan. Sprinkle chocolate chips on top. Bake at 325 degrees for 45–55 minutes.
**You can substitute 3/4 cup Ghirardelli Sweet Ground Chocolate for the cocoa and white sugar, putting it in at the same time the cocoa would be added.
